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The CCTV footage which has emerged from Arthur Hooper's shows Sergio and his staff urging customers inside to hide.

An attacker wearing a hoax suicide vest repeatedly tries to pull the door open from the other side, just inches away from dozens of customers.

The worker then momentarily opens the door to let in another man to safety before slamming it shut again.

An attacker wearing a hoax suicide vest repeatedly tries to pull the door open from the other side, just inches away from dozens of customers.

But Sergio single-handedly pushes against the door.

Arthur Hooper's in Borough Market (Image: Google Street)

Eventually the knife-wielding terrorist give up and continue down the street.

Sergio said he began lowering the shutters when he saw the terrorists, and that "all he could see was a guy with dynamite," IBT reports.

"We did not know how many terrorists there were and whether they would return," he said, before modestly adding: "You do not even think about it. I could have left, as everyone did, but I would have left 28 people behind."

Members of the emergency services attending to a person injured in the London Bridge attack (Image: AFP)